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Mechanisms and Kinetics of CO2 Reactions in Mafic and Ultramafic Rock Formations

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Mechanisms and Kinetics of CO2 Reactions in Mafic and Ultramafic Rock Formations Geological Sequestration of CO2: Mechanisms and Kinetics of CO2 Reactions in Mafic and Ultramafic Rock Formations Investigators: Principal Investigator: Gordon E. Brown, Jr., Professor, Department of Geological & Environmental Sciences; Co-Investigators: Dennis K. Bird, Professor, Department of Geological & Environmental Sciences; Tom Kendelewicz, Senior Research Associate, Department of Geological & Environmental Sciences; Kate Maher, Assistant Professor, Department of Geological & Environmental Sciences; Wendy Mao, Assistant Professor, Department of Geological & Environmental Sciences; Natalie Johnson, Ph.D. Student, Department of Chemical Engineering; Robert J. Rosenbauer, Research Scientist, U.S. Geological Survey, Menlo Park, CA; Pablo García Del Real, Undergraduate and Incoming M.S. Student, Department of Geological & Environmental Sciences, Stanford University. Abstract The main purpose of this exploratory project is to develop a more fundamental understanding of the long-term sequestration of CO2 via mineral carbonation reactions involving the common Mg-silicates in serpentinite and basalt mineral assemblages. Past experimental studies have shown that these reactions are kinetically limited, so we are exploring ways to enhance their kinetics, including the use of activators such as organic acids and catalysts such as natural metalloenzymes that enhance the rate of conversion of hydrated CO2 to bicarbonate ions. During the past year, we have combined surface science studies of (1) the interaction of CO2 and H2O with Mg-oxides and Mg-silicates, (2) hydrothermal experimental studies of the rates of Mg-silicate carbonation reactions, (3) reactive transport modeling of these carbonation reactions in initially porous Mg- silicate rocks, and (4) field-based studies of natural analogs of serpentinite carbonation reactions. We have carried out first-of-their-kind in situ ambient pressure photoemission spectroscopy (APPES) studies of the interaction of CO2 and CO2 + H2O with model Mg- oxide surfaces, initiated experimental hydrothermal studies of the rate of interaction of CO2-rich aqueous solutions with Mg-olivine and other Mg-silicates, completed preliminary simulations of these and other reactions of CO2-rich aqueous solutions with Mg-silicates using the reactive transport code CrunchFlow, and are beginning field studies of natural analogs with a focus on identifying all carbonate phases. Our in situ APPES studies have shown that the interaction of 0.2 Torr of CO2 with a model MgO (100) surface results in rapid formation of MgCO3 and that subsequent exposure to 0.1 Torr of H2O enhances the reaction. In contrast, when water is reacted with MgO(100) first, followed by reaction with CO2, the carbonation reaction is inhibited. This observation may help explain enhanced carbonation of Mg-silicates upon preheating. Our numerical reactive transport simulations of the reaction of CO2-rich fluids with Mg- silicates have shown that under the conditions relevant for subsurface CO2 injection, primary mineral dissolution, coupled with the spatial distribution of reaction fronts along the flow path, allow for efficient precipitation of Mg-carbonate without complete destruction of the initial porosity. This finding contrasts with previous closed-system batch reactor models that suggested the positive volume change during Mg-silicate carbonation would result in complete filling of the pore space. Over the range of initial 1 and boundary conditions considered, the rate of mineral carbonation was proportional to the flux of CO2 into the system, with nearly complete removal of CO2 by precipitation of Mg-carbonate. Our simulations also show that if silica concentrations are maintained below quartz saturation, the very large volume increase in the carbonation of Mg-olivine can be reduced substantially and passivation of the Mg-olivine surface by silica can potentially be reduced as well. We also conclude from our preliminary simulations that the effects of aqueous organic ligands on the dissolution rates, solubilities, and stabilities of Mg-silicates relative to carbonate minerals are likely to be of first-order importance in optimizing the industrial utility of geologic sequestration of CO2 in ultramafic and mafic rock formations. Introduction Recent estimates (e.g., Deffeyes, 2005) suggest that world oil and natural gas reserves are sufficient to allow their continued use as major energy sources for the next 200 years. Coupled with the burning of coal for electric power generation, this usage will result in increasing levels of CO2 in the atmosphere unless safe, efficient, and cost-effective means of CO2 sequestration (capture and storage) are found. An attractive option for long-term storage of CO2 is the use of deep sedimentary formations (e.g., Gunter et al., 2004; Hepple and Benson, 2005; Benson and Surles, 2006; Marini, 2007), although there is some concern about potential migration and seepage of CO2 from sedimentary formations, particularly if cement casings of old wells leak (e.g., Kharaka et al., 2006, 2007) or if the waste stream gas is not pure CO2 (e.g., Knauss et al., 2005). Such formations typically consist of feldspathic sandstones (quartz, K-feldspar, plagioclase feldspar, calcite, kaolinite, chlorite, muscovite/illite, pyrite) and carbonates (calcite, dolomite, siderite, pyrite) that contain Na-Ca-Cl brine solutions in the pore spaces. The CO2 injection causes the reservoir fluid to become acidic, resulting in the dissolution of silicate and carbonate minerals and subsequent growth of carbonate minerals that consume the liberated metal cations (Knauss et al., 2005). Geochemical simulations by Knauss et al. (2005) suggest that the presence of SO2 in the waste stream gas would result in a solution pH that remains too low for carbonate minerals to be stable in the short term (< 100 years); however, as the pH is neutralized over time due to increased silicate mineral dissolution, additional carbonate mineral formation should result in enhanced CO2 sequestration. Another possible strategy for the geological sequestration of CO2 involves the reaction of CO2 with Mg silicates, which, in the form of serpentinites and picrites, are abundant and thermodynamically convenient rocks for the formation of Mg-carbonates (e.g., Seifritz, 1990; Lackner et al., 1995, 1997; Lackner, 2002; Schulze et al., 2004; Zevenhoven et al., 2006). For example, the carbonation reaction of lizardite, one of the common serpentine minerals in the rock serpentinite, may be written as Mg3Si2O5(OH)4 (lizardite) + 3CO2 = 3MgCO3 (magnesite) + 2SiO2 + 2H2O (1) and is exothermic (-63.6 kJ/mol CO2), with a volume change (ΔV/V) of ~ +20%. In addition, serpentinites are relatively abundant in Earth’s crust and are widely distributed (Figure 1). Nature has performed relevant experiments in many of these serpentinite 2 localities, which show that this (or a similar) reaction is rather common and results in large quantities of magnesite and other Mg-, Ca- and Fe-carbonate minerals (Figure 2). A B Figure 2: (A) Massive magnesite deposit formed by alteration of serpentinite by CO2- rich groundwater in the New Idria District, CA (Brown, pers. comm.; see Brown and Mattinson, 2007); (B) Photograph of picritic basalts cut by massive veins of magnesite (MgCO3) in Nuussuaq, West Greenland, that were formed by interactions of the picrite with CO2-rich fluids. (D. Bird, pers. comm.; see Rogers et al., 2006). Our exploratory study is focused on the mechanisms and kinetics of the interaction of CO2 (and H2O) with both serpentinites and picrites, as well as with the individual serpentine minerals lizardite, antigorite, and chrysotile, and the individual minerals found in picritic basalts, including forsterite, Mg-pyroxene, and Ca-plagioclase. Our initial focus is on (1) changes in the surface chemistry of these minerals (both elemental and isotopic) following carbonation reactions, (2) molecular-level characterization of reaction products using synchrotron-based surface chemistry methods (from which information on reaction intermediates and products can be derived), (3) kinetic studies of these surface carbonation reactions using stable isotopes as tracers, and (4) development of a reactive transport framework for performing field-scale simulations of reactions between aqueous 3 CO2 and ultramafic rock formations. Assuming success during the initial year of our proposed investigation, our long-term goal is to discover ways to enhance reaction kinetics of CO2 with these minerals such that costs associated with carbonation reaction of Mg-silicates can be reduced at the production/engineering scale. Background Over the past year several papers have been published which discuss the advantages of CO2 injection into ultramafic rock formations, including deep-sea basalts (Goldberg et al., 2008; Oelkers et al., 2008) and peridotites (Kelemen & Matter, 2008; Andreani et al., 2009). The potential advantages are (1) rapid conversion of CO2 to stable carbonate minerals thus reducing the risk of CO2 release, (2) potential blockage of upward CO2 migration due to impermeable (and previously undisturbed) sediment cover, (3) for sea- floor injections and the possibility of CO2-hydrate accumulation when escaped CO2 contacts cool overlying formation water or seawater, and (4) substantial fracture networks due to the initial emplacement processes. The first in situ CO2 mineralization test project, CarbFix (www.carbfix.com), also began this year in Hellisheidi, Iceland (Alfredsson et al., 2008; Oelkers
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